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In Typography , leading ( IPA , rhymes with ''heading'') refers to the amount of added vertical Spacing between lines of type. In consumer-oriented word processing software, this concept is usually referred to as "'''line spacing'''." Leading may sometimes be confused with Tracking , which refers to the horizontal spacing between letters or characters.

The word comes from lead strips that were put between set lines. When type was set by hand in Printing Presses , slugs or strips of Lead (reglets) of appropriate thicknesses were inserted between lines of type to add vertical space, to fill available space on the page.

Text set "solid" (no leading) appears cramped, with Ascender s almost touching Descender s from the previous line. The lack of white space between lines makes it difficult for the eye to track from one line to the next, and hampers Readability .

The following block of text has no leading:

''Typography'' ( using a combination of Typeface Styles , Point Sizes , Line Length s, Line Leading , Character Spacing , and Word Spacing to produce Typeset Artwork in physical or digital form.



This block of text set with 50% leading is easier to read:

''Typography'' ( using a combination of Typeface Styles , Point Sizes , Line Length s, Line Leading , Character Spacing , and Word Spacing to produce Typeset Artwork in physical or digital form.



This block of text at 100% leading is also easy to read, but makes less efficient use of vertical page space:

''Typography'' ( using a combination of Typeface Styles , Point Sizes , Line Length s, Line Leading , Character Spacing , and Word Spacing to produce Typeset Artwork in physical or digital form.



In CSS , leading is implemented by the line-height property.